code: def test_listdir_local(self):
      file_list = listdir(self.resource_path)
      assert len(file_list) > 0
  
imports: import os.path
  import shutil
  import pytest
  import tempfile
  from bigdl.orca.data.file import open_image, open_text, load_numpy, exists, listdir, makedirs, rmdir, write_text, enable_multi_fs_load_static
label_desc: Use image node_id 14 for calling the TestFile obj's underlying member method code with example usage: obj.test_listdir_local() without return types